Surah At-Tawbah, ayah 26

ثُمَّ أَنزَلَ ٱللَّهُ سَكِينَتَهُۥ عَلَىٰ رَسُولِهِۦ وَعَلَى ٱلْمُؤْمِنِينَ وَأَنزَلَ جُنُودًا لَّمْ تَرَوْهَا وَعَذَّبَ ٱلَّذِينَ كَفَرُوا۟ وَذَٰلِكَ جَزَآءُ ٱلْكَٰفِرِينَ ۝٢٦

Then Allāh sent down His tranquility upon His Messenger and upon the believers and sent down soldiers [i.e., angels] whom you did not see and punished those who disbelieved. And that is the recompense of the disbelievers.

Quran 9:26 (At-Tawbah) · Saheeh International, Noor International Center (QuranEnc v1.1.2)